摘要目的 观察人支气管上皮细胞(16HBE)的DNA甲基转移酶1(DNMT1)基因低表达细胞株细胞周期和基因组整体甲基化水平的改变.方法 用慢病毒介导的RNA干扰方法将4个不同的短发夹RNA片段转染16HBE细胞,并用免疫印迹法(Western blotting)检测该细胞DNMT1蛋白表达水平,用流式细胞仪和5-甲基胞嘧啶(5-mC)免疫荧光法检测该细胞的细胞周期和细胞基因组整体甲基化水平.结果 16HBE-shDNMT1-4细胞株的DNMT1蛋白表达与对照组相比平均降低约44%,差异有统计学意义(P＜0.05),但细胞周期和基因组整体甲基化水平无明显改变.结论 成功建立DNMT1基因低表达的16HB细胞株,其细胞周期和基因组整体甲基化水平无明显改变.

abstractsObjective To construct DNA methyltransferase 1 (DNMT1) low expression 16HBE cell line and observe the variation of cell cycle and global genomic DNA methylation. Methods The method of Lenti-virus induced RNA interference was applied to introduce four different shRNA fragment into 16HBE cells. Flow cytometry and 5-mC immunofluorescence methods were used to observe the cell cycle and global DNA methylation status of DNMT1 low expression 16HBE cells. Results The DNMT1 protein relative expression level of 16HBE-shDNMT1-4 cell line was down regulated about 44%(P＜0.05 ) compared with the control. No obvious differences of cell cycle and global genome DNA methylation status were observed between the 16HBE and 16HBE-shDNMT1. Conclusion The DNMT1 gene low expression cell is successfully constructed, and there are no obvious changes happened on the cell cycle and global genomic DNA methylation.